“…Heisenberg and Jordan (1926) Thomas (1926,1927) Pauli (1927) Breit (1928) Breit (1928b) Darwin (1928b) Dirac (1928ab) Gordon (1928b) Johnson and Lippmann (1949,1950) Sewell (1949) Foldy and Wouthuysen (1950) Saenz (1950) Foldy (1952) Huang (1952) Barker and Chraplyvy (1953) K.M. Case (1954) Hirschfelder et al (1954) Okubo (1954) Good (1955) Koba (1956) 9 Table 2.…”